Attenuation compensation of low-velocity layers using micro-seismogram logs: case studies

High-frequency components of seismic data can be seriously attenuated when seismic waves propagate through low-velocity layers and, therefore, seismic resolution and signal-to-noise (S/N) ratio can be deteriorated. In order to enhance the resolution and improve the S/N ratio, we use micro-seismogram logs to design an inverse filter for attenuation compensation of the seismic data. After applying the inverse filter to the seismic section, high-frequency components are compensated with the low-frequency components maintained. This means that the seismic resolution and S/N ratio are enhanced after compensation: the high-frequency compensation is both critical and valid, proved by comparison with frequency swept stack sections.